Re: Fooling Oxegen Sensor Output
 

Let us know how it works out for you. I still have the one I made, but after experimenting with it for awhile and seeing no positive results I just turned it off and that's the way it's been for since.

Re: Fooling Oxegen Sensor Output
 

The purpose of the EFIE is to add voltage to the signal from the O2 sensor to the computer giving it a "rich" signal, which would allow the computer to lean out the mix. It used one and it did that and I also have the car "test" smoged with the EFIE on and it did run lean. All the numbers improved except the NOX which went through the roof. The numbers were 2-3X normal and if it had been an official test I would have failed. The 14.7:1 is the compromise the EPA has established between mileage and pollution. If you go leaner, then you are adding more O2 in the system, which then combines with the N in the air causing more NOX.

Re: Fooling Oxegen Sensor Output
 

For a post cat O2 sensor, wouldn't an EFIE be pointless.... or cause another CEL. Post cat O2 sensors are just for testing catalyst efficiency.... the ones before the cat control the mixture.

What you want is a mil eliminator

https://www.paladinmicro.com/MustangMILEliminator.htm

edit: AHHH what a noob mistake. I responded to an old thread that someone revived.

Re: Fooling Oxegen Sensor Output
 

lol, It happens.